Pneumatic bumper



Oct. 11,v 1927.

- l 1,645,056 w. JERRAE PNEUMATIC BUMPER 'Filed sept. e, 192e 'l Illlllllu Patented Oct. 11, 1927.

UNITED STATES PATENT OFFICE.

WILLIAM J'EBBAE, SAN FRANCISCO, CALIFORNIA'.

Application mea september s, ieee. serial No. 134,225.

Figure 3 1s a rear elevation of the casing,`

Figure4 is a cross section on the line 1 -4, Figure 5 is a cross section on the line 5 5, Figure 6 is across section on the line 6-6 Figure 7 isA a detail of the small leaf Spring l Thepneumatic bumper consists of an in^ fiated casing 1 of tire fabric and rubber bolted to a steel spring 2 which in turn is fastened to brackets 3 by means of short leaf springs 4. The brackets 3 may be of diiferent sizes and shapes to fit different makes of car.

The bumper contains an inner tube 5in the manner of an automobile tire, with a valve 6. A tread 7 protects the front of the casing 1, the edges of which casing are clamped between an inner steel strip 8 and the spring 2 by means of bolts 9, counter sunk in the strip 8.

A slit is provided in the outer casing l for the insertion Aof the inner tube 5 and the steel strip 8. Overlapping flaps 10 and l1 close the opening.

The short leaf springs 4 are provided with,

slots 12 thru which they are bolted to the 40 spring 2, the slots providing sliding contact for the ends of the short s rings and enabling them to function as s ockabsorbers. The pneumatic bumper is iniiated to about twenty pounds pressure, and acting in conjunction with the springs serves almost completely to absorb the shock of collision.

nstead of damaging, denting, or marring the object struck or brushed, the bumper con'- forms to its shape, and reduces the noise and violence of the shock to a General harmony is secured by having the pneumatic bumper correspond in size to the tires of the car, but it is not desired to limit this specification to any particular vsize or desi I claim:

1. A bumper having in 4combination a pneumatic cushion, comprising a rubber fabric casing for said cushion, a thickened rubber facing upon said casing, a slit in said casing, overlapping edges of said slit, an air tight rubber tube within said casing, a valve in said tube, a bumper spring to the rear of said pneumatic cushion, a steel strip on the rear inner wall of said casing; bolts'clamping together said steel strip, said overlapping edges, and said -bumper s ring, small leaf springs attached rearwar y of said bumper spring, slots in said leaf springs,`

brackets supporting said leaf springs, and bolts passing thru said slots and attaching said leaf springs to said bum er spring.

2. An automobile bumper aving in combination a pneumatic cushion, a spring bumper backing said cushion, small leaf springs acking' said spring bumfper, and brackets for attaching .said lea Y springs to an automobile. j

3. A bumper having in combination a main spring, leaf springs `behind said main spring, vslots in said leaf springs, and bolting means for slidably attaching said" slotted leaf springs to said main sprmg.

In testimony whereof I hereby aiiix my WILLIAM JERRAE.

. signature, 

